For
example, the cost a conventional
Indian design fixed dome anaerobic
digester is estimated at approximately
US$500 for a family scale unit (Preston,
1995). An investment of this scale is
likely to be prohibitive for many small
and subsistence farmers, even if they
recognise the potential benefits.
Changes in the design to exploit more
affordable materials can dramatically
alter the cost and therefore the
potential impact of such technologies,
with low cost digesters now being
promoted at less than US$50 per family
unit (Ibid.).